EP1937893A2 - Tamis d'egouttage et procede de fabrication dudit tamis - Google Patents

Tamis d'egouttage et procede de fabrication dudit tamis

Info

Publication number
EP1937893A2
EP1937893A2 EP06776829A EP06776829A EP1937893A2 EP 1937893 A2 EP1937893 A2 EP 1937893A2 EP 06776829 A EP06776829 A EP 06776829A EP 06776829 A EP06776829 A EP 06776829A EP 1937893 A2 EP1937893 A2 EP 1937893A2
Authority
EP
European Patent Office
Prior art keywords
watermark
screen
sheet
entwässerungssieb
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06776829A
Other languages
German (de)
English (en)
Other versions
EP1937893B1 (fr
Inventor
Bernd Stumbeck
André Gregarek
Andreas HÄNELT
Thomas Gerhardt
Karlheinz Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to PL06776829T priority Critical patent/PL1937893T3/pl
Priority to SI200630875T priority patent/SI1937893T1/sl
Publication of EP1937893A2 publication Critical patent/EP1937893A2/fr
Application granted granted Critical
Publication of EP1937893B1 publication Critical patent/EP1937893B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper

Definitions

  • the invention relates to a dewatering screen for the production of paper with multilevel watermarks, in particular for the production of
  • the invention further relates to a method for producing such a dewatering screen and to a method for producing a paper having a multi-level watermark using such a dewatering screen.
  • multi-level In the production of paper with watermarks, a distinction is made between two-level watermarks with a strong light-dark effect and multi-level watermarks with smooth transitions between light and dark and detailed representation of a motif.
  • multi-level is to be understood in contrast to two-level light-dark watermark and includes all watermarks with more than two brightness levels and includes in particular watermarks with continuous HeIl dark transitions.
  • metal wires or metal moldings are typically applied to the screen printing. soldered to completely close the drainage screen at these points. As a result, paper accretion in partial areas of the dewatering screen is hindered and thin spots are formed in the paper, which appear very bright when viewed through transmitted light.
  • the present invention seeks to provide a dewatering screen of the type mentioned, which avoids the disadvantages of the prior art and in particular allows the production of paper with multi-level watermark high brightness.
  • a dewatering screen of the type mentioned in the introduction comprises a carrier screen and a perforated watermark plate connected to the carrier screen, wherein the carrier screen and the watermark plate are stamped together in the form of the watermark to be produced.
  • the perforations of the watermark sheet ensure dewatering during paper production.
  • the watermark sheet is provided with microperforations, the dimensions of which are so small that fibers do not adhere to them during papermaking.
  • the watermark sheet may in particular be provided with microperforation having a diameter of less than 0.6 mm, preferably less than 0.25 mm, more preferably less than 0.2 mm. Micro perforations with a diameter of 0.17 mm are particularly suitable.
  • the watermark sheet may have perforations of the same diameter throughout. Of course, it is also possible to combine perforations with different diameters.
  • the perforations of the watermark sheet are preferably arranged regularly and in the form of a matrix in the form of rows and columns. Lines lying one above the other can also be offset from each other by half a hole-to-hole distance.
  • the surface of the watermark sheet is advantageously smooth, so that only relatively few fibers attach, so that the subsequent watermark has a high has overall brightness. Due to the greater brightness, it is advisable to apply the design of the watermark according to the invention sharper than in conventional watermarks and to perform the embossing with a slightly lower modulation.
  • the watermark sheet also has recesses in the form of patterns, characters or codes.
  • These recesses in contrast to the microperforations, are designed with such dimensions that fibers form in them during the sheet formation, so that the recesses produce dark areas in the later watermark.
  • the dimensions of the recesses are typically a few millimeters.
  • the dewatering screen may additionally comprise at least one imperforate metal or plastic molded part adjacent to the watermark sheet for producing two-level watermarks.
  • the watermark sheet in particular the mentioned recesses of the watermark sheet and the adjacent unperforated metal / plastic molding represent information related to each other.
  • the recesses and the molded parts can complement each other to form a contiguous sequence of numbers or a coherent text.
  • the digit string or text may be further related to a graphic motif represented by the watermark sheet.
  • the watermark sheet may show a portrait or an architectural motif
  • the recesses and / or the molded parts may include a text associated with the motif, such as a name or a signature. put.
  • the number sequence can also form another independent information, such as the denomination of a banknote.
  • the watermark sheet is preferably glued to the support screen, soldered or welded.
  • the carrier screen is formed by a screen fabric having at least one respective system of interwoven, longitudinally extending warp threads and weft threads running transversely thereto.
  • the screen fabric may in particular have a single-layer or double-layered binding.
  • the carrier screen is formed by a galvanically produced screen.
  • Such screens have no nodes as they are created by crossings in the filaments of a conventional sieve.
  • the overall thickness of the screen may be less than that of conventional screens.
  • the carrier screen is formed by a carrier plate provided with drainage openings.
  • such carrier plates have no nodes, so that the total thickness of the screen may possibly be less than in conventional screens and can be used with less material gap when milling the embossing sticks.
  • the Smoother screen surface can lead to much sharper watermarks. Also can be produced in this way inserts for a module screen. It is only necessary to produce small units and use as a module in wells.
  • a computer file performs a desired watermark corresponding milling in plastic.
  • a computer file performs a desired watermark corresponding milling in plastic.
  • electrically conductive printing ink such as silver conductive paint
  • a very fine screen structure is printed on the plastic matrix.
  • a metal layer is deposited along this screen structure in the galvanic bath.
  • the screen structure can also be applied to the plastic matrix by means of photographic processes, similar to the production of semiconductor devices.
  • a sheet metal layer shaped in accordance with the milling does not deposit, as is the case with electroplated embossing dies, but already a finished screen structure. This can then be soldered or welded onto a carrier screen.
  • the sieve structure produced in this way like galvanic sieves, has no nodes and thus allows full sharpness and the finest details in the watermark.
  • the process of embossing can be omitted. This also eliminates the process of converting from the computer file to the watermark, which often results in some alteration of the original. Furthermore, it can already be taken into account when creating the screen structure to be printed on the plastic, where the subsequent watermark should have particularly light or dark spots, in that the line thickness to be printed on is varied accordingly. This leads to different drainage behavior in the Watermark area and thus allows a large and accurately controllable contrast increase over conventional technology.
  • the described drainage screens may be round screens or wire screens or inclined screens.
  • the invention also includes a method for producing a dewatering screen for papermaking, in which
  • the watermark plate is connected to the carrier screen
  • a sheet is preferably cut out according to the contour of the desired water mark and provided with microperforations, the dimensions of which are so small that they do not adhere to fibers during papermaking.
  • the microperforations are advantageously produced by means of etching or with a laser beam.
  • the watermark sheet is applied to the support screen, preferably glued or welded.
  • a carrier screen in particular a screen mesh can be provided in step a).
  • a carrier screen can be produced in the galvanic bath.
  • the or a support plate can be provided to form a support strainer with drainage holes.
  • the invention further comprises a method for producing a paper, in particular a security paper, with multistage watermarks, in which the paper attachment takes place on a dewatering screen of the type described.
  • FIG. 1 is a schematic representation of a banknote with a multi-level watermark
  • FIG. 2 shows in (a) a bright multi-level watermark according to the invention and in (b) a conventional watermark;
  • Fig. 3 is a plan view of a section of an inventive
  • Fig. 4 is a detail of Fig. 3.
  • Fig. 5 shows schematically a cross section of the Entskyssansssiebs
  • FIG. 1 shows a schematic representation of a banknote 10 which contains a bright multi-level watermark 12 in the form of a portrait only indicated in FIG.
  • the bright watermark 12 produced according to the invention is shown in detail in FIG. 2 (a). Especially in comparison with the conventional watermark 14 of FIG. 2 (b), the significantly higher overall brightness of the watermark 12 according to the invention can be seen.
  • FIG. 3 shows a plan view of a section of a dewatering screen 20 according to the invention.
  • FIG. 4 shows the detail 40 in the edge region of the watermark plate 24 in detail
  • FIG. 5 shows schematically a cross section of the dewatering screen 20 along the line VV of Figure 3.
  • the drainage screen 20 comprises a carrier screen, which in the exemplary embodiment is formed by a screen mesh 22, and a microperforated watermark plate 24 welded onto the screen mesh 22.
  • the watermark plate 24 is corresponding to the contour 26 of the desired watermark, here the outline of the portrait 12, and provided with a regular matrix-like arrangement of microperforations 28 to ensure dewatering in papermaking.
  • the microperforations 28 in the exemplary embodiment have a diameter of 0.18 mm and a perforation-to-perforation distance of 0.20 mm. With this small diameter, no paperwork can be used - -
  • Adhere fibers in the perforations 28 so that they can not interfere with the later watermark.
  • the microperforations 28 may be introduced into the watermarked sheet 24 by conventional techniques such as etching or laser.
  • the screen fabric 22 and the welded watermark sheet 24 according to the invention jointly embossed according to the relief structure of the desired watermark, as shown schematically in the cross-sectional view of FIG. 5.
  • the modulation height M of the embossing is chosen to be somewhat lower than in the case of conventional watermarks and may be, for example, about 0.9 mm.
  • the high brightness of the watermarks generated by the dewatering screen 20 is mainly due to the smooth surface of the watermark plate 24, to which only comparatively few fibers can adhere. Because of the greater overall brightness, the watermark design 12 is sharper than conventional watermarks.
  • the watermark sheet 24 may further include targeted recesses 30 in the form of patterns, characters, and encodings that result in dark spots in the later watermark.
  • the watermark plate 24 can also be combined with imperforate molded parts 32 made of metal or plastic, in particular the so-called electrotypes, which produce, for example, two-stage watermarks for representing the denomination of a banknote.
  • the recesses 30 and the molded parts 32 can also represent information related to one another, for example two parts of a total information.
  • the numbers "135" then appear as a dark place, the numbers " 7911 "as an immediately adjoining highlight, it is of course also possible to use an alphanumeric character string, for example a signature or the like, instead of the digit sequence.

Landscapes

  • Paper (AREA)
  • Centrifugal Separators (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Water Treatment By Sorption (AREA)
  • Filtering Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fertilizers (AREA)
EP06776829A 2005-09-06 2006-08-14 Tamis d'egouttage et procede de fabrication dudit tamis Not-in-force EP1937893B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL06776829T PL1937893T3 (pl) 2005-09-06 2006-08-14 Sito odwadniające oraz sposób jego wykonania
SI200630875T SI1937893T1 (sl) 2005-09-06 2006-08-14 Filter za odstranjevanje vode in postopek izdelave le-tega

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005042344A DE102005042344A1 (de) 2005-09-06 2005-09-06 Entwässerungssieb und Verfahren zu seiner Herstellung
PCT/EP2006/008017 WO2007028485A2 (fr) 2005-09-06 2006-08-14 Tamis d'egouttage et procede de fabrication dudit tamis

Publications (2)

Publication Number Publication Date
EP1937893A2 true EP1937893A2 (fr) 2008-07-02
EP1937893B1 EP1937893B1 (fr) 2010-11-03

Family

ID=37735593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06776829A Not-in-force EP1937893B1 (fr) 2005-09-06 2006-08-14 Tamis d'egouttage et procede de fabrication dudit tamis

Country Status (7)

Country Link
EP (1) EP1937893B1 (fr)
AT (1) ATE486998T1 (fr)
DE (2) DE102005042344A1 (fr)
ES (1) ES2353817T3 (fr)
PL (1) PL1937893T3 (fr)
SI (1) SI1937893T1 (fr)
WO (1) WO2007028485A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2532084A (en) * 2014-11-10 2016-05-11 De La Rue Int Ltd Improvments in watermarking

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008024401B3 (de) * 2008-05-20 2010-01-07 Hans Grossmann Entwässerungssieb für eine Saugwalze einer Papiermaschine
FR2957943B1 (fr) * 2010-03-24 2021-11-05 Arjowiggins Security Filigrane, procedes de fabrication d'une piece pour la formation d'un filigrane et piece obtenue selon ledit procede
IT1400463B1 (it) * 2010-05-06 2013-05-31 Cartiere Fedrigoni & C Spa Procedimento per la realizzazione di una tela filigranatrice, tela filigranatrice e impianto per il suo ottenimento
DE102012024774A1 (de) * 2012-12-18 2014-06-18 Giesecke & Devrient Gmbh Entwässerungssieb für die Papierherstellung
EP2828432B2 (fr) * 2012-03-19 2022-06-29 Portals Paper Limited Électrotype pour former une image pendant un procédé de fabrication de papier
DE102013021179A1 (de) * 2013-12-17 2015-06-18 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
CH709680A1 (de) 2014-05-21 2015-11-30 Landqart Ag Entwässerungssieb für die Herstellung von Papier mit wenigstens einem Wasserzeichen und damit hergestelltes Papier mit einem Wasserzeichen.
RU2019130344A (ru) * 2017-02-27 2021-03-29 Крейн Энд Ко., Инк. Бумага, включающая в себя один или более многотоновых водяных знаков, имеющих полную тональность, и усовершенствованный инструмент для нанесения водяных знаков для изготовления такой бумаги
WO2019033889A1 (fr) * 2017-08-17 2019-02-21 保定钞票纸业有限公司 Procédé de préparation de papier susceptible de réguler la luminosité de filigrane et produit de papier comprenant un filigrane à haute luminosité

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2804447B1 (fr) * 2000-02-01 2002-04-05 Arjo Wiggins Sa Papier comportant un filigrane a effet multiton et toile pour fabriquer ce papier
DE10064006A1 (de) * 2000-12-21 2002-07-04 Giesecke & Devrient Gmbh Wasserzeichenform für die Papierherstellung und Verfahren zur Applizierung derselben auf einem Schöpfsieb
DE10145782A1 (de) * 2001-09-17 2003-04-10 Giesecke & Devrient Gmbh Papiersieb zur Erzeugung zweistufiger Wasserzeichen und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007028485A2 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2532084A (en) * 2014-11-10 2016-05-11 De La Rue Int Ltd Improvments in watermarking
GB2532084B (en) * 2014-11-10 2017-09-06 De La Rue Int Ltd Improvments in watermarking
US10632780B2 (en) 2014-11-10 2020-04-28 Portals De La Rue Limited Watermarking

Also Published As

Publication number Publication date
WO2007028485A8 (fr) 2010-07-29
PL1937893T3 (pl) 2011-04-29
WO2007028485A3 (fr) 2007-05-31
DE102005042344A1 (de) 2007-03-08
ATE486998T1 (de) 2010-11-15
DE502006008248D1 (de) 2010-12-16
SI1937893T1 (sl) 2011-02-28
ES2353817T3 (es) 2011-03-07
EP1937893B1 (fr) 2010-11-03
WO2007028485A2 (fr) 2007-03-15

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